{"id":37770,"date":"2025-05-13T12:30:58","date_gmt":"2025-05-13T12:30:58","guid":{"rendered":""},"modified":"2025-08-09T18:58:35","modified_gmt":"2025-08-10T00:58:35","slug":"cve-2025-0855-unauthenticated-php-object-injection-in-pgs-core-wordpress-plugin","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-0855-unauthenticated-php-object-injection-in-pgs-core-wordpress-plugin\/","title":{"rendered":"<strong>CVE-2025-0855: Unauthenticated PHP Object Injection in PGS Core WordPress Plugin<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In the world of cybersecurity, the detection of new vulnerabilities is an ongoing process. One such vulnerability that has been recently identified is CVE-2025-0855, which affects the PGS Core plugin for WordPress. It is a critical <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-35963-os-command-injection-vulnerabilities-in-gtkwave\/\"  data-wpil-monitor-id=\"42445\">vulnerability that can lead to PHP Object Injection<\/a>, enabling attackers to inject a PHP Object without requiring any authentication. This issue concerns not only individual WordPress site owners but also businesses and organizations that use this plugin, as it can <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4050-heap-corruption-in-google-chrome-devtools-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"43071\">potentially lead to severe consequences such as system<\/a> compromise or sensitive data leakage.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-0855<br \/>\nSeverity: Critical (CVSS score: 9.8)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: This vulnerability, if successfully exploited, can lead to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-30165-potential-system-compromise-in-vllm-v0-engine\/\"  data-wpil-monitor-id=\"44043\">system compromise<\/a> and data leakage.<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3086115660\" class=\"ameeb-content-2 ameeb-entity-placement\"><div style=\"border-left: 4px solid #555; padding-left: 20px; margin: 48px 0; font-family: Roboto, sans-serif; color: #ffffff; line-height: 1.6; max-width: 700px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 20px; font-weight: 600; display: flex; align-items: center;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 8px;\">\r\n      <img decoding=\"async\" src=\"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/10\/Best-App-icon-Ameeba.png\" alt=\"Ameeba Chat Icon\" style=\"width: 40px; height: 40px;\" \/>\r\n    <\/a>\r\n    A new way to communicate\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 12px;\">\r\n    Ameeba Chat is built on encrypted identity, not personal profiles.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 16px;\">\r\n    Message, call, share files, and coordinate with identities kept separate.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 20px;\">\r\n    <li>\u2022 Encrypted identity<\/li>\r\n    <li>\u2022 Ameeba Chat authenticates access<\/li>\r\n    <li>\u2022 Aliases and categories<\/li>\r\n    <li>\u2022 End-to-end encrypted chat, calls, and files<\/li>\r\n    <li>\u2022 Secure notes for sensitive information<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px;\">\r\n    Private communication, rethought.\r\n  <\/p>\r\n\r\n  <div style=\"display: flex; flex-wrap: wrap; gap: 12px;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\/download\" style=\"background-color: #ffffff; color: #000000; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Download Ameeba Chat<\/a>\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Learn More<\/a>\r\n  <\/div>\r\n<\/div>\r\n<\/div>\n<p>Product | Affected Versions<\/p>\n<p>PGS Core <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-13418-critical-arbitrary-file-upload-vulnerability-in-multiple-wordpress-plugins-and-themes\/\"  data-wpil-monitor-id=\"42943\">WordPress Plugin<\/a> | Up to and including 5.8.0<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit takes advantage of an issue in the &#8216;import_header&#8217; function of the PGS Core <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4391-wordpress-echo-rss-feed-post-generator-plugin-arbitrary-file-upload-vulnerability\/\"  data-wpil-monitor-id=\"50868\">plugin for WordPress<\/a>. This function does not adequately verify the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-30391-microsoft-dynamics-input-validation-vulnerability-leading-to-unauthorized-information-disclosure\/\"  data-wpil-monitor-id=\"42619\">validity of input<\/a> before deserializing it, thereby allowing the injection of PHP Objects. An attacker can exploit this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-1305-cross-site-request-forgery-csrf-vulnerability-in-newsblogger-wordpress-theme\/\"  data-wpil-monitor-id=\"42522\">vulnerability by sending a specially crafted request<\/a> to the vulnerable application, leading to PHP Object Injection. If a Property-Oriented Programming (POP) chain exists in any additional plugin or theme installed on the system, the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-36864-integer-overflow-vulnerability-in-gtkwave-3-3-115-with-potential-for-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"42505\">vulnerability can be further exploited to delete arbitrary<\/a> files, retrieve sensitive data, or execute arbitrary code.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-4114985912\" class=\"ameeb-content ameeb-entity-placement\"><div class=\"poptin-embedded\" data-id=\"f6b387694f681\"><\/div>\r\n\r\n\r\n\r\n\r\n\r\n<\/div>\n<p>Here&#8217;s an illustrative example of how an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-42959-unauthenticated-replay-attack-exploiting-hmac-reuse\/\"  data-wpil-monitor-id=\"71291\">attacker might exploit<\/a> this vulnerability. This example is purely conceptual and should not be used in a real-world scenario.<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/wp-content\/plugins\/pgs-core\/inc\/importers\/import_header.php HTTP\/1.1\nHost: vulnerable-wordpress-site.com\nContent-Type: application\/php\nO:8:&quot;stdClass&quot;:1:{s:4:&quot;file&quot;;s:27:&quot;\/path\/to\/arbitrary\/file.php&quot;;}<\/code><\/pre>\n<p>In this example, an attacker sends a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4389-arbitrary-file-upload-vulnerability-in-wordpress-crawlomatic-multipage-scraper-post-generator-plugin\/\"  data-wpil-monitor-id=\"51094\">POST request to the &#8216;import_header.php&#8217; file<\/a>, which is part of the PGS Core plugin. The payload includes an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-46337-a-critical-sql-injection-vulnerability-in-adodb-php-database-class-library\/\"  data-wpil-monitor-id=\"42772\">injected PHP<\/a> Object that references an arbitrary file. If the server has a POP chain that allows <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-45238-arbitrary-file-deletion-vulnerability-in-foxcms-v1-2-5\/\"  data-wpil-monitor-id=\"43131\">file deletion<\/a>, this request could potentially delete the referenced file.<\/p>\n<p><strong>Mitigation and Recommendations<\/strong><\/p>\n<p>The best way to mitigate this vulnerability is by applying the vendor patch. Users of the PGS Core <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31914-critical-sql-injection-vulnerability-in-pixel-wordpress-form-builder-plugin-autoresponder\/\"  data-wpil-monitor-id=\"54804\">plugin for WordPress<\/a> should upgrade to the latest version as soon as possible. As a temporary measure, one can use Web Application Firewall (WAF) or an Intrusion Detection System (IDS) to detect and <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49155-uncontrolled-search-path-vulnerability-in-trend-micro-apex-one-data-loss-prevention-module\/\"  data-wpil-monitor-id=\"71292\">prevent exploitation of this vulnerability<\/a>. However, these are not long-term solutions and do not address the underlying issue. Regularly updating and patching <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-20188-cisco-ios-xe-software-for-wireless-lan-controllers-security-vulnerability\/\"  data-wpil-monitor-id=\"44077\">software is essential in maintaining a secure<\/a> online environment.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In the world of cybersecurity, the detection of new vulnerabilities is an ongoing process. One such vulnerability that has been recently identified is CVE-2025-0855, which affects the PGS Core plugin for WordPress. It is a critical vulnerability that can lead to PHP Object Injection, enabling attackers to inject a PHP Object without requiring any [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-37770","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/37770","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/comments?post=37770"}],"version-history":[{"count":14,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/37770\/revisions"}],"predecessor-version":[{"id":63766,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/37770\/revisions\/63766"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=37770"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=37770"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=37770"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=37770"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=37770"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=37770"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=37770"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=37770"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=37770"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}